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Article
Comparison of the influence of 1-propanol and of 2-propanol on the viscoelastic solutions of cetyltrimethylammonium bromide (CTAB) and sodium salicylate (NaSal)
It is known that mixtures of CTAB and NaSal form viscoelastic solutions. For a 100 mM CTAB solution and increasing NaSal concentration, the viscosity increases strongly at a concentration of 10 mM NaSal, reach...
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Article
Rheological behavior of wormlike micelles (WLMs) in alcohol/water mixed solvent: influence of alcohol chain length
The influence of replacing water with ethanol, propanol, and butanol in alcohol–water mixtures on the rheological properties of wormlike micelles (WLMs) consisting of sodium salicylate (NaSal) and cetyltrimeth...
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Article
The phase transition from L3 phase to vesicles and rheological properties of a nonionic surfactant mixture system
A sponge phase (L3 phase) was observed in aqueous solution of a nonionic surfactant polyethylene glycol ether of tridecyl alcohol with the average 3 of ethylene oxide (CH3(CH2)12(OCH2CH2)3OH, abbreviated as Tride...
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Article
Lamellar phase formation in catanionic mixtures of hydrogenated and fluorinated surfactants: a comparative study
The properties and phase behaviors of the catanionic mixtures consisting of tetradecyltrimetylammonium bromide (TTABr) and different anionic surfactants (i.e., sodium docanoate, C10HOONa; sodium laurate, C12HOONa...
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Article
Bilayer swelling of nonionic surfactant and sodium dodecylsulfate mixed system by refractive-index matching
Bilayer swelling behavior of nonionic and anionic surfactant mixed aqueous solution induced by adding glycerin was studied. The phenomenon were performed on a system, polyethylene glycol ether of tridecyl alco...
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Article
Boosting the stability of protein emulsions by the synergistic use of proteins and clays
The preparation and the properties of high-pressure emulsions based on five different proteins are reported. As proteins, we used the well-studied bovine serum albumin (BSA), a biotechnical produced hydrophobi...
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Article
Influence of co-solvent on the rheological behavior of aqueous viscoelastic surfactant solutions
We have studied the influence of glycerol on the rheological behavior of viscoelastic surfactant solutions. The measurements were carried out on the system CTAB and NaSal. This system shows two viscosity maxim...
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Chapter
Colloid Chemistry: The Fascinating World of Microscopic Order
In this work, we explain how small surfactant molecules with dimensions of one to two nanometers,when dissolved in water with a concentration of a few weight percent, organize themselves spontaneouslyinto vari...
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Article
The distinction of viscoelastic phases from entangled wormlike micelles and of densely packed multilamellar vesicles on the basis of rheological measurements
It is shown in this work how two viscoelastic surfactant systems that are both shear thinning but differ in their morphology can be distinguished on the basis of rheological measurements. The measurements were...
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Chapter and Conference Paper
Vesicular precipitates from surfactant/cosurfactant mixtures
A new anionic surfactant lauryl amidomethylsulfate (LAMS-) was investigated. The aggregation behaviour was determined by small-angle neutron scattering (SANS) measurements. The Na-salt micelles are highly charged...
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Article
The cumulant method for computational kinetic theory
We propose a new method for numerical simulation of gas dynamics based on kinetic theory. The method is based on a cumulant-expansion-ansatz for the phase space density, which leads to a set of quasi-linear, h...
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Article
Thinning and thickening effects induced by shearing in lecithin solutions of polymer-like micelles
The effects of shear flow on the lecithin organogels consisting of reverse polymer-like micelles have been investigated by dynamic rheology. It was established that the shear effects depended on the molar rat...
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Article
Non-linear rheology and flow-induced transition of a lamellar-to-vesicle phase in ternary systems of alkyldimethyl oxide/alcohol/water
The time-dependent transformation of an ionically charged lamellar phase (L α-phase) into a vesicle phase under the influence of shear is investigated using rheological and conductivity measurements. The L α-pha...
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Article
Liquid crystalline suspensions of poly(tetrafluoroethylene) 'whiskers'
Theoretical treatments predict that solutions of long rod-like molecules above a critical concentration should separate spontaneously into an isotropic and an anisotropic, or liquid crystalline phase1–3. It has b...
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Chapter
The Formation of Micelles
The dissolution process of substances in a solvent can be described by three steps: In the first step the substances must be molecularly dispersed; in the second, holes have to be formed in the interior of the...
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Article
Ein Beitrag zur Uroporphyrinbestimmung
Zur Bestimmung der Uroporphyrine im Harn wurde Cellulosepulver als ausgezeichnetes Adsorptionsmittel angewendet. Man erhält ein sauberes Eluat, das sich sehr gut zur spektralphotometrischen oder fluorometrisch...
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Article
Chronopotentiometrie mit sägezahnförmigen Stromimpulsen
Einleitend werden Vorteile der Chronopotentiometrie gegenüber der Polarographie diskutiert. Es werden chronopotentiometrische Konzentrationsbestimmungen mit sägezahnförmigen statt mit den üblichen rechteckigen...
